drivers/staging/rdma/ehca/ehca_av.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  address vector functions
   5  *
   6  *  Authors: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
   7  *           Khadija Souissi <souissik@de.ibm.com>
   8  *           Reinhard Ernst <rernst@de.ibm.com>
   9  *           Christoph Raisch <raisch@de.ibm.com>
  10  *
  11  *  Copyright (c) 2005 IBM Corporation
  12  *
  13  *  All rights reserved.
  14  *
  15  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  16  *  BSD.
  17  *
  18  * OpenIB BSD License
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions are met:
  22  *
  23  * Redistributions of source code must retain the above copyright notice, this
  24  * list of conditions and the following disclaimer.
  25  *
  26  * Redistributions in binary form must reproduce the above copyright notice,
  27  * this list of conditions and the following disclaimer in the documentation
  28  * and/or other materials
  29  * provided with the distribution.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  32  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  34  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  35  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  36  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  37  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  38  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  39  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44 #include <linux/slab.h>
  45
  46 #include "ehca_tools.h"
  47 #include "ehca_iverbs.h"
  48 #include "hcp_if.h"
  49
  50 static struct kmem_cache *av_cache;
  51
  52 int ehca_calc_ipd(struct ehca_shca *shca, int port,
  53                   enum ib_rate path_rate, u32 *ipd)
  54 {
  55         int path = ib_rate_to_mult(path_rate);
  56         int link, ret;
  57         struct ib_port_attr pa;
  58
  59         if (path_rate == IB_RATE_PORT_CURRENT) {
  60                 *ipd = 0;
  61                 return 0;
  62         }
  63
  64         if (unlikely(path < 0)) {
  65                 ehca_err(&shca->ib_device, "Invalid static rate! path_rate=%x",
  66                          path_rate);
  67                 return -EINVAL;
  68         }
  69
  70         ret = ehca_query_port(&shca->ib_device, port, &pa);
  71         if (unlikely(ret < 0)) {
  72                 ehca_err(&shca->ib_device, "Failed to query port  ret=%i", ret);
  73                 return ret;
  74         }
  75
  76         link = ib_width_enum_to_int(pa.active_width) * pa.active_speed;
  77
  78         if (path >= link)
  79                 /* no need to throttle if path faster than link */
  80                 *ipd = 0;
  81         else
  82                 /* IPD = round((link / path) - 1) */
  83                 *ipd = ((link + (path >> 1)) / path) - 1;
  84
  85         return 0;
  86 }
  87
  88 struct ib_ah *ehca_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  89 {
  90         int ret;
  91         struct ehca_av *av;
  92         struct ehca_shca *shca = container_of(pd->device, struct ehca_shca,
  93                                               ib_device);
  94
  95         av = kmem_cache_alloc(av_cache, GFP_KERNEL);
  96         if (!av) {
  97                 ehca_err(pd->device, "Out of memory pd=%p ah_attr=%p",
  98                          pd, ah_attr);
  99                 return ERR_PTR(-ENOMEM);
 100         }
 101
 102         av->av.sl = ah_attr->sl;
 103         av->av.dlid = ah_attr->dlid;
 104         av->av.slid_path_bits = ah_attr->src_path_bits;
 105
 106         if (ehca_static_rate < 0) {
 107                 u32 ipd;
 108
 109                 if (ehca_calc_ipd(shca, ah_attr->port_num,
 110                                   ah_attr->static_rate, &ipd)) {
 111                         ret = -EINVAL;
 112                         goto create_ah_exit1;
 113                 }
 114                 av->av.ipd = ipd;
 115         } else
 116                 av->av.ipd = ehca_static_rate;
 117
 118         av->av.lnh = ah_attr->ah_flags;
 119         av->av.grh.word_0 = EHCA_BMASK_SET(GRH_IPVERSION_MASK, 6);
 120         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_TCLASS_MASK,
 121                                             ah_attr->grh.traffic_class);
 122         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
 123                                             ah_attr->grh.flow_label);
 124         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
 125                                             ah_attr->grh.hop_limit);
 126         av->av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1B);
 127         /* set sgid in grh.word_1 */
 128         if (ah_attr->ah_flags & IB_AH_GRH) {
 129                 int rc;
 130                 struct ib_port_attr port_attr;
 131                 union ib_gid gid;
 132
 133                 memset(&port_attr, 0, sizeof(port_attr));
 134                 rc = ehca_query_port(pd->device, ah_attr->port_num,
 135                                      &port_attr);
 136                 if (rc) { /* invalid port number */
 137                         ret = -EINVAL;
 138                         ehca_err(pd->device, "Invalid port number "
 139                                  "ehca_query_port() returned %x "
 140                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
 141                         goto create_ah_exit1;
 142                 }
 143                 memset(&gid, 0, sizeof(gid));
 144                 rc = ehca_query_gid(pd->device,
 145                                     ah_attr->port_num,
 146                                     ah_attr->grh.sgid_index, &gid);
 147                 if (rc) {
 148                         ret = -EINVAL;
 149                         ehca_err(pd->device, "Failed to retrieve sgid "
 150                                  "ehca_query_gid() returned %x "
 151                                  "pd=%p ah_attr=%p", rc, pd, ah_attr);
 152                         goto create_ah_exit1;
 153                 }
 154                 memcpy(&av->av.grh.word_1, &gid, sizeof(gid));
 155         }
 156         av->av.pmtu = shca->max_mtu;
 157
 158         /* dgid comes in grh.word_3 */
 159         memcpy(&av->av.grh.word_3, &ah_attr->grh.dgid,
 160                sizeof(ah_attr->grh.dgid));
 161
 162         return &av->ib_ah;
 163
 164 create_ah_exit1:
 165         kmem_cache_free(av_cache, av);
 166
 167         return ERR_PTR(ret);
 168 }
 169
 170 int ehca_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 171 {
 172         struct ehca_av *av;
 173         struct ehca_ud_av new_ehca_av;
 174         struct ehca_shca *shca = container_of(ah->pd->device, struct ehca_shca,
 175                                               ib_device);
 176
 177         memset(&new_ehca_av, 0, sizeof(new_ehca_av));
 178         new_ehca_av.sl = ah_attr->sl;
 179         new_ehca_av.dlid = ah_attr->dlid;
 180         new_ehca_av.slid_path_bits = ah_attr->src_path_bits;
 181         new_ehca_av.ipd = ah_attr->static_rate;
 182         new_ehca_av.lnh = EHCA_BMASK_SET(GRH_FLAG_MASK,
 183                                          (ah_attr->ah_flags & IB_AH_GRH) > 0);
 184         new_ehca_av.grh.word_0 = EHCA_BMASK_SET(GRH_TCLASS_MASK,
 185                                                 ah_attr->grh.traffic_class);
 186         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_FLOWLABEL_MASK,
 187                                                  ah_attr->grh.flow_label);
 188         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_HOPLIMIT_MASK,
 189                                                  ah_attr->grh.hop_limit);
 190         new_ehca_av.grh.word_0 |= EHCA_BMASK_SET(GRH_NEXTHEADER_MASK, 0x1b);
 191
 192         /* set sgid in grh.word_1 */
 193         if (ah_attr->ah_flags & IB_AH_GRH) {
 194                 int rc;
 195                 struct ib_port_attr port_attr;
 196                 union ib_gid gid;
 197
 198                 memset(&port_attr, 0, sizeof(port_attr));
 199                 rc = ehca_query_port(ah->device, ah_attr->port_num,
 200                                      &port_attr);
 201                 if (rc) { /* invalid port number */
 202                         ehca_err(ah->device, "Invalid port number "
 203                                  "ehca_query_port() returned %x "
 204                                  "ah=%p ah_attr=%p port_num=%x",
 205                                  rc, ah, ah_attr, ah_attr->port_num);
 206                         return -EINVAL;
 207                 }
 208                 memset(&gid, 0, sizeof(gid));
 209                 rc = ehca_query_gid(ah->device,
 210                                     ah_attr->port_num,
 211                                     ah_attr->grh.sgid_index, &gid);
 212                 if (rc) {
 213                         ehca_err(ah->device, "Failed to retrieve sgid "
 214                                  "ehca_query_gid() returned %x "
 215                                  "ah=%p ah_attr=%p port_num=%x "
 216                                  "sgid_index=%x",
 217                                  rc, ah, ah_attr, ah_attr->port_num,
 218                                  ah_attr->grh.sgid_index);
 219                         return -EINVAL;
 220                 }
 221                 memcpy(&new_ehca_av.grh.word_1, &gid, sizeof(gid));
 222         }
 223
 224         new_ehca_av.pmtu = shca->max_mtu;
 225
 226         memcpy(&new_ehca_av.grh.word_3, &ah_attr->grh.dgid,
 227                sizeof(ah_attr->grh.dgid));
 228
 229         av = container_of(ah, struct ehca_av, ib_ah);
 230         av->av = new_ehca_av;
 231
 232         return 0;
 233 }
 234
 235 int ehca_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 236 {
 237         struct ehca_av *av = container_of(ah, struct ehca_av, ib_ah);
 238
 239         memcpy(&ah_attr->grh.dgid, &av->av.grh.word_3,
 240                sizeof(ah_attr->grh.dgid));
 241         ah_attr->sl = av->av.sl;
 242
 243         ah_attr->dlid = av->av.dlid;
 244
 245         ah_attr->src_path_bits = av->av.slid_path_bits;
 246         ah_attr->static_rate = av->av.ipd;
 247         ah_attr->ah_flags = EHCA_BMASK_GET(GRH_FLAG_MASK, av->av.lnh);
 248         ah_attr->grh.traffic_class = EHCA_BMASK_GET(GRH_TCLASS_MASK,
 249                                                     av->av.grh.word_0);
 250         ah_attr->grh.hop_limit = EHCA_BMASK_GET(GRH_HOPLIMIT_MASK,
 251                                                 av->av.grh.word_0);
 252         ah_attr->grh.flow_label = EHCA_BMASK_GET(GRH_FLOWLABEL_MASK,
 253                                                  av->av.grh.word_0);
 254
 255         return 0;
 256 }
 257
 258 int ehca_destroy_ah(struct ib_ah *ah)
 259 {
 260         kmem_cache_free(av_cache, container_of(ah, struct ehca_av, ib_ah));
 261
 262         return 0;
 263 }
 264
 265 int ehca_init_av_cache(void)
 266 {
 267         av_cache = kmem_cache_create("ehca_cache_av",
 268                                    sizeof(struct ehca_av), 0,
 269                                    SLAB_HWCACHE_ALIGN,
 270                                    NULL);
 271         if (!av_cache)
 272                 return -ENOMEM;
 273         return 0;
 274 }
 275
 276 void ehca_cleanup_av_cache(void)
 277 {
 278         kmem_cache_destroy(av_cache);
 279 }